Most water tracking apps do simple math: multiply your weight by 30, hand you a daily goal, and call it a day. The same number is shown to someone sitting at a desk all morning and to someone running for an hour at lunch. Your body knows the difference even if your app doesn't.
Suu is now a full AI health assistant. It works two-way with Apple Health (iOS) and Google Fit (Android), reads the workouts you do during the day, analyzes their type, duration and intensity, and updates your daily hydration goal in real time. Run 5 km at 2 PM and your 3 PM goal already reflects it.
Why Activity-Based Tracking Matters
During exercise, your body loses fluid through three main channels:
- Sweat: 0.5-2 liters per hour depending on intensity
- Respiration: Active breathing loses humidity — 100-200 ml per hour
- Thermoregulation: The hotter your body, the more sweat is needed to cool it
The American College of Sports Medicine (ACSM) recommends drinking 150-300 ml every 15-20 minutes during exercise and replacing 1.5 liters of fluid per kg of weight lost after exercise. In practice this is usually skipped because users have to calculate amounts manually.
How Suu Detects Your Activity
Apple Health Read
All workout data is read from iPhone, Apple Watch and other HealthKit-compatible devices.
Google Fit Read
On Android, Google Health Connect lets Suu read data from Wear OS, Fitbit, Garmin and more.
Dynamic Goal
Daily goal automatically rises based on activity type, duration and intensity.
Instant Notification
"30-min run detected — your goal is up by 400 ml. Time to drink some water!"
Combined With Weather
The same run on a hot day adds more water than on a cold one — Suu knows.
Athlete Mode
For serious athletes: MET-based calculation and electrolyte reminders for long sessions.
Water Needs by Activity Type
Sample scenarios calculated by Suu's scientific formula (70 kg person, moderate temperature):
| Activity | Duration | Intensity | Extra Water |
|---|---|---|---|
| Walking (4 km/h) | 30 min | Low | +200 ml |
| Brisk walking (6 km/h) | 45 min | Moderate | +350 ml |
| Light jog | 30 min | Moderate | +400 ml |
| Running (8 km/h) | 30 min | High | +450 ml |
| Running (10 km/h) | 60 min | High | +900 ml |
| Swimming (pool) | 60 min | Moderate | +600 ml |
| Cycling (road) | 60 min | Moderate | +500 ml |
| Cycling (mountain) | 60 min | High | +750 ml |
| Weight training | 60 min | Moderate | +400 ml |
| HIIT / CrossFit | 30 min | Very high | +500 ml |
| Yoga / Pilates | 60 min | Low | +200 ml |
| Hot yoga / Bikram | 60 min | High | +700 ml |
| Tennis | 60 min | Moderate | +550 ml |
| Soccer (match) | 90 min | High | +1,000 ml |
| Basketball | 60 min | High | +700 ml |
💡 The science: Suu uses the formula MET (Metabolic Equivalent) × duration × body weight × intensity factor for each activity. References include ACSM and the European College of Sport Sciences (ECSS).
Weather × Activity — Combined Adjustment
The strongest part of Suu: activity data isn't used in isolation — it's combined with real-time weather conditions.
- Hot day (32°C+) + 30-min run: 600-700 ml addition instead of standard 400 ml
- High humidity (>70%) + 60-min cycling: 750 ml instead of standard 500 ml
- Cold day (<10°C) + 30-min walk: Standard 200 ml — you still sweat in cold weather, just less
The OpenWeatherMap integration updates temperature and humidity hourly. Training in the desert in summer? Suu knows.
When Does It Trigger?
Activity-based goal adjustment runs in two ways:
1. Real-Time Detection
If you have an Apple Watch or a connected Wear OS watch, Suu gets notified the moment your workout ends:
- "35-min run completed. Daily goal +450 ml (new total: 3,250 ml)."
- "60-min swim completed. Goal +600 ml — drink 500 ml within the first 30 minutes after training."
2. Background Sync
Hourly background sync scans Apple Health / Google Fit. Workouts logged manually in another app (Nike Run Club, Strava, Garmin Connect) are also detected and counted in your goal.
Athlete Mode — For Serious Trainers
Premium subscribers unlock Athlete Mode with extras:
- Pre / during / post-workout zones: Three separate water targets per session
- Electrolyte reminders: Suggested Na/K/Mg replacement for sessions over an hour
- Pre/post body-weight integration: True sweat rate from weight delta
- VO2 max & heart-rate zone detection: Apple Watch zone data is read directly
- Race mode: 24-hour staged hydration plan before competition
Suu vs Other Water Tracking Apps
WaterMinder and Hydro Coach use activity data in a limited way:
- WaterMinder: Reads only step count from Apple Health; activity type doesn't factor in.
- Hydro Coach: Activity level is a one-time manual selection, not dynamic.
- Plant Nanny: No activity integration at all.
- Suu: Reads real workouts from Apple Health + Google Fit, combines type, duration, intensity and weather, and adjusts the goal automatically.
Try 3 Days Free
Activity-based dynamic goals, caffeine and sugar tracking, AI hydration coach — try every Premium feature free for 3 days. After that: 50% launch discount, $15/year (≈ ₺600 / ≈ 56 SAR).
Frequently Asked Questions
I don't have an Apple Watch — does activity-based goal still work?
Yes. The Health app on iPhone records steps and movement automatically without an Apple Watch. Suu reads from there. Workouts logged in Strava, Nike Run Club, Garmin Connect and other apps are also picked up.
I'm on Android with no Wear OS watch — what works?
Android phones include built-in step counters, and Google Fit auto-detects activities. As long as your phone is in your pocket, walks and runs are detected automatically.
Can I add an activity manually?
Yes. Even with no smartwatch and no auto-detection, you can manually log an activity in the app — pick type, duration, intensity, and Suu updates the goal accordingly.
How do I undo an addition?
If an activity was misdetected (a phone shaken too much registering false steps, for example), open the activity log and delete it. The goal recalculates automatically.